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Anthony J.C. Madu
Bridget N. Ozibo
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Bridget N. Ozibo
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International Journal Geology and Mining

Geology of parts of Gboko and Makurdi Local Government Areas, Benue State, Nigeria

Madu Anthony Joseph Chinenyeze* and Bridget N. Ozibo

*Department of Geology, College of Physical and Applied Sciences, Michael Okpara University Umudike, Abia State, Nigeria.

Department of Geology/Geophysics/Physics, Federal University, Ndufu-Alike-Ikwo FUNAI, Ebonyi State, Nigeria.

Accepted 05 May, 2017.

Citation: Madu AJC, Ozibo BN (2017). Geology of parts of Gboko and Makurdi Local Government Areas, Benue State, Nigeria. International Journal Geology and Mining 3(1): 071-080.

Copyright: © 2017 Madu and Ozibo. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Abstract

The study area lies within the middle Benue trough consisting of a sedimentary terrain, and igneous rocks at the northern part. The area has three drainage basins separated by a water divide that trends nearly north-south. The sedimentary terrain comprises mainly sandstone of Makurdi Sandstone with common fold axes trending Southwest-Northeast. It has grain size distribution and stratigraphic signatures suggestive of fluvial environment. The limestone unit is of a smaller area and circumscribed by the sandstone. Fossils identified in the limestone include mostly pelecypods, gastropods and ammoids. The limestone unit is a probable member of Eze-Aku shale. Evidence of igneous activity in the study area is the emplacement of extrusive and intrusive rocks. The extensive rock is porphyritic basalt, with olivine phenocrysts, augite and analcite. The mineral assemblage suggests that the basalt is of alkaline affinity. The intrusive rocks are dolerite and felsic dolerite, with predominance of lime-bearing plagioclase over all other minerals in the felsic dolerite.

Key words: Sediments, sandstone, limestone, igneous activity, sedimentary structures.